— No smoking here, sir!— Oh, sorry. A. Thank you for your reminding.B. It’s none of your

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(答案→)A. Thank you for your reminding.
B. It’s none of your business.
C. What a great idea!
D. Do you want one?
解析：考查情景交际。句意：--先生，这里禁止吸烟！--噢，对不起。谢谢你的提醒。A谢谢你的提醒；B不关你的事；C好主意；D要来一支吗。B项显得没有礼貌；根据sorry可知，那位先生已经道歉了，C、D与语境不符，故选A。